Just guessing, I'd say it would take you about as long to write the 
assembly version as to learn enough C to get a FAT level SD card access 
to work using the existing libraries.  If you choose the C route, you're 
going to learn about something that could give you a big tool to put in 
your bag for the future, but if you choose the assembly route, you're 
going to learn all the ins and outs of the SD card interface and FAT 
structure.  If you want to become a FAT guru, choose assembly, but if 
you just want to get the project to work without an intimate knowledge 
of the inner workings while getting the side benefit of much faster 
future software development, choose C.

best wishes either way,

Tony


David Duffy wrote:
> Going back to the project that prompted all this; does it sound 
> reasonable to write assembly code for accessing an SD card and dealing 
> with the FAT?
> David...
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